Ans1. Answer by Dev Kumar Singh

What Is DAX in Power BI? Explained Simply
DAX stands for Data Analysis Expressions. It's a formula language used in Power BI, Excel Power Pivot, and SQL Server Analysis Services (SSAS) to perform data calculations and analysis.

🔍 In Simple Words:
DAX is like Excel formulas but much more powerful. You use DAX to create:

New Columns

New Measures (like Total Sales, Average Profit)

Custom calculations in visuals

💡 Example:
Let’s say you have a sales table:

Product Quantity Price
Pen 10 5

You can write a DAX formula to calculate Total Sales:

DAX
Copy
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Total Sales = SUMX(Sales, Sales[Quantity] * Sales[Price])
This multiplies Quantity × Price for each row and adds it all together.

🧠 Why DAX Is Powerful:
It works with large data models

Can do time intelligence (e.g., sales this month vs last month)

Works fast with big data

Helps create smart dashboards

🚀 Common DAX Functions:
SUM() – Adds values

AVERAGE() – Finds average

CALCULATE() – Makes custom filters

IF() – Works like Excel IF

RELATED() – Connects tables

🧩 Where Do You Use DAX in Power BI?
In calculated columns

In measures (like Total Profit)

In visuals (show only top 5 cities, etc.)

📌 Summary:
DAX = Excel formulas + database power
It lets you do deep and custom analysis in Power BI.

If you want, I can also make:

YouTube video description

A thumbnail for this topic

Or even explain each DAX function with examples